Hybrid External Cavity Laser with an Amorphous Silicon-Based Photonic Crystal Cavity Mirror

Iadanza, Simone; Devarapu, Ganga Chinna Rao; Liles, Alexandros A.; Sheehan, Robert; O’Faoláin, Liam

doi:10.3390/app10010240

Cited by 11 publications

(6 citation statements)

References 19 publications

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“…Recent advances in light confinement at the wavelength scale are leading to smaller and smaller high-performance resonators fabricated on silicon-on-insulator platforms. Specifically, spherical cavities [6], toroidal cavities [7,8], and photonic crystal (PhC) cavities [9][10][11][12][13][14] offer very low optical losses [i.e., high quality (Q) factors [15]], low coupling losses [16], and small mode volumes in the range of λ 3 , and enable the investigation of cavity quantum electrodynamics [17], all-optical computing [18], lasing and parametric oscillations [19][20][21], and enhanced nonlinear processes [22,23]. The wavelength scale confinement of light in microcavities leads to a huge enhancement of the relatively small optical nonlinearities of silicon [24].…”

Section: Introductionmentioning

confidence: 99%

Model of thermo-optic nonlinear dynamics of photonic crystal cavities

Iadanza

Clementi

et al. 2020

Phys. Rev. B

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The wavelength scale confinement of light offered by photonic crystal (PhC) cavities is one of the fundamental features on which many important on-chip photonic components are based, opening silicon photonics to a wide range of applications from telecommunications to sensing. This trapping of light in a small space also greatly enhances optical nonlinearities and many potential applications build on these enhanced light-matter interactions. In order to use PhCs effectively for this purpose it is necessary to fully understand the nonlinear dynamics underlying PhC resonators. In this work, we derive a first principles thermal model outlining the nonlinear dynamics of optically pumped silicon two-dimensional (2D) PhC cavities by calculating the temperature distribution in the system in both time and space. We demonstrate that our model matches experimental results well and use it to describe the behavior of different types of PhC cavity designs. Thus, we demonstrate the model's capability to predict thermal nonlinearities of arbitrary 2D PhC microcavities in any material, only by substituting the appropriate physical constants. This renders the model critical for the development of nonlinear optical devices prior to fabrication and characterization.

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Section: Introductionmentioning

confidence: 99%

Model of thermo-optic nonlinear dynamics of photonic crystal cavities

Iadanza

Clementi

et al. 2020

Phys. Rev. B

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“…The duplexers were fabricated using the standard CMOS compatible method 32 , 33 . To optimize fabrication tolerance and transmittance, various device configurations are employed.…”

Section: Methodsmentioning

confidence: 99%

Highly efficient and selective integrated directional couplers for multigas sensing applications

Thottoli,

Biagi,

Vorobev

et al. 2023

Sci Rep

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The design and fabrication of a compact, low-loss, broadband directional coupler (DC) based duplexer operating in the near-infrared (NIR) region are demonstrated. The duplexer exhibits high selectivity and coupling efficiency (CE), for target wavelengths of 1530 nm and 1653.7 nm, making it applicable in systems for the multi-gas detection of ammonia and methane. The measured CE for the duplexer is 73% and 76% at 1530 nm and 1653.7 nm respectively. These results demonstrate the effectiveness of the duplexer as a broadband and scalable power source for highly sensitive sensing techniques, like quartz-enhanced photoacoustic spectroscopy (QEPAS). Its compact size and low-loss characteristics make it highly portable and well-suited for drone-based multi-gas detection applications.

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“…2 b), on which the actual photonic components are developed. The poly:Si islands were having different sizes ranging from 10 to 1000 µm 2 , therefore able to accommodate one or multiple photonic crystal cavities to be employed as wavelength selective mirrors in hybrid external cavity lasers (HECLs) in vertical coupling configuration 31 , 32 . As the optical performances of poly:Si strongly depend on surface roughness, which dominates scattering losses, the CMP process had to be optimised to achieve the highest surface smoothness, ideally in the sub-nm range, for the photonic components to be able to have measured Q-factors at least in the 10 3 range (e.g., minimum values required to get a single-mode PhC-based lasers, as seen in 33 ).…”

Section: Fabrication and Optimisation Of The Poly:si Substrates For P...mentioning

confidence: 99%

“…The photonic crystal resonator located in the silicon islanded may be connected to other components via a waveguiding layer position vertically above. A variety of components have been demonstrated in vertically coupled configuration such as photodetectors 36 modulators 37 and lasers 32 . Such a configuration is ideally suited to this application as the interconnecting waveguides do not reduce the area available for transistors.…”

Section: Measurement Of the Fabricated Phc Cavities On Poly:simentioning

confidence: 99%

Polycrystalline silicon PhC cavities for CMOS on-chip integration

Iadanza

Devarapu

Blake³

et al. 2022

Sci Rep

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In this work, we present an on-chip 2D and 3D photonics integration solution compatible with Front End of Line integration (FEOL) using deposited polycrystalline silicon (poly:Si) for optical interconnects applications. Deposited silicon integration on a bulk silicon wafer is here discussed in all its processing steps and configurations. Moreover, results of deposited silicon high-Q Photonic Crystal (PhC) resonators are shown, demonstrating the possibility to employ optical resonators patterned on this material in the next generation of 2D and 3D integrated optical interconnects.

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Hybrid External Cavity Laser with an Amorphous Silicon-Based Photonic Crystal Cavity Mirror

Cited by 11 publications

References 19 publications

Model of thermo-optic nonlinear dynamics of photonic crystal cavities

Model of thermo-optic nonlinear dynamics of photonic crystal cavities

Highly efficient and selective integrated directional couplers for multigas sensing applications

Polycrystalline silicon PhC cavities for CMOS on-chip integration

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